In recent years, significant progress has been made by motion-based methods [1]}, [2]}, [3]}, [4]}. These methods first estimate the bidirectional optical flows and then synthesize the target frame by warping two successive frames forward or backward. In general, these motion-based methods can explicitly represent the motion and reach high fidelity in most cases. However, due to the basic assumptions of the optical flow estimation, e.g. smoothness and consistency, motion-based methods are inherently difficult to handle the interpolation of complicated dynamic scenes which include the regions suffering from occlusion, blur, or abrupt brightness change [5]}.
